How smartphone read accelerometer when togglw switch on in Flutter?

Question

I make app to read accelerometer but I have difficult to read accelerometer sensor log. Anyway, I used toggle switch. The problem is when I turned on toggle switch, the accelerometer only read once not my trial before by used button component. These the code below:

import 'dart:async';
import 'dart:math';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:sensors_plus/sensors_plus.dart';

class WalkingApp extends StatefulWidget {
  const WalkingApp({super.key});

  @override
  State<WalkingApp> createState() => _WalkingAppState();
}

class _WalkingAppState extends State<WalkingApp> {
  bool isSwitched = false;

  var _accel = 0.0;
  var _currentAcc = 0.0;
  var lastAccel = 0.0;
  var stepCount = 0;
  var x= 0.0, y=0.0, z=0.0;

  late Timer timer;

  
    void stop() {
    setState(() {
      isSwitched = false;
      _accel = 0.0;
      for (StreamSubscription<dynamic> subscription in _streamSubscriptions) {
        subscription.cancel();
      }
    });
  }

   //walk
  final _streamSubscriptions = <StreamSubscription<dynamic>>[];

  @override
  void initState() {
    super.initState();
    _streamSubscriptions.add(
        accelerometerEvents.listen((AccelerometerEvent event) {
          setState(() {
            x = event.x;
            y = event.y;
            z = event.z;
          });
        })
    );
  }

   void start() {
    isSwitched = true;
    setState(() {
        hitungStep(x, y, z);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
          child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          SwitchListTile(
            title: const Text('Jalan',
                style: TextStyle(color: Colors.black87, fontSize: 16.0)),
            value: isSwitched,
            onChanged: (value) {
              setState(() {
                (!isSwitched) ? start(): stop();
              });
            },
            activeTrackColor: Colors.blueAccent,
            activeColor: Colors.blue,
          ),
          const SizedBox(height: 16),
          Text('$stepCount',
              style: const TextStyle(color: Colors.cyan, fontSize: 48.0)),
          const SizedBox(height: 8),
          const Text('Langkah',
              style: TextStyle(color: Colors.black54, fontSize: 18.0)),
        ],
      )),
    );
  }

   void hitungStep(double x, double y, double z) {
    _accel = 10;
    _currentAcc = 9.8;
    lastAccel = 9.8;

    lastAccel = _currentAcc;

    _currentAcc = sqrt((x*x)+(y*y)+(z*z));
    var delta = _currentAcc - lastAccel;
    _accel = delta.abs();
    if(_accel > 1){
      stepCount++;
    }

    if(kDebugMode){
      print('nilai x :$x, nilai y: $y, nilai z: $z, accel: $_accel');
    }
  }


  @override
  void dispose() {
    super.dispose();
    for (final subscription in _streamSubscriptions) {
      subscription.cancel();
    }
  }
}

My expectation is when turning on toggle and the phone still read accelerometer log like I pressed button. Would you like to help solve problem? what should I do?

How smartphone read accelerometer when togglw switch on in Flutter?

0 Answers0